Method of pasting or coating paper



(No Model.\

M. P. WILSON. METHOD OF PASTING OR COATING PAPER.

Patented June 2, 1891 UNITED STATES PATENT OFFICE.

MERRICK F. IYILSON, OF CHICAGO, ILLINOIS.

METHOD OF PASTING OR COATING PAPER.

SPECIFICATION forming part of Letters Patent No. 453,394, dated June 2, 1891.

Application filed August 31, 1888. Serial No. 284,247. (No model.)

To all whom, it may concern.-

Be it known that I, MERRICK F. WILSON, of Chicago, in the county of Cook and State of Illinois, have invented a certain new and Improved Method of Pasting or Coating Paper or other Thin Material, of which the following-is a specification.

I employ a machine which applies a thin uniform coating of paste, gum-arabic, or other adhesive material upon one side of each sheet of paper or other thin material fed through it. I have in my experiments applieda solution of the adhesive material known as dextrine on one side of pieces of paper to be used for covering what are known as paperboxesboxes the bodies of which are formed of pasteboard or other stout forms of paperstock out and folded to the required form. The sheets are introduced one by one and are delivered in corresponding succession with the clean side downward upon an endless traveling apron, from which each may be removed at leisure and applied upon box-bodies or otherwise used, as may be desired.

The accompanying drawings form a part of this specification and represent what I consider the best means of carrying out the invention.

Figure 1 is a general side elevation, a portion of the mid-length of the delivery-table or work-table and apron being broken away to curtail the length of the figure. Fig. 2 is an elevation of a portion at right angles to the view in Fig. 1. Fig. 3 is on alarger scale. It is a central longitudinal section of a portion of the machine. Fig. a is a plan view of a portion thereof.

,. similar letters of reference indicate corre sponding parts in all the figures where they occur.

A is a fixed frame-work of cast-iron or other suitable material, and A a table or horizontal platform supported thereon, by the aid of which the sheets are successively fed into the machine. A is a tank supported on the framing and containing a quantity of a solution of dextrine or other fluid, or semi-fluid adhesive material.

B is a drum of brass or other suitable material, having its surface truly cylindrical. Its axis, supported in fixed bearings, is slowly turned by the aid of a gear-wheel B, engagperforations g.

ing with a pinion D, carried on the main large pulley D on the same shaft gives motion through the medium of a belt E and pulley F to a blower F, which may be of any suitable character. I have in my experiments used the style known as Roots blower. A strong current of air impelled by this blower is conducted upward in a pipe G, which extends across the machine near the under side of the drum B, and is thickly bored with These are set so as to blow toward the drum, but not squarely. The current of air is blown from the perforations g at an inclination forward.

C is a sliding gate mounted in the base of the tank A lVhen the machine is in operation, the gate is adjusted so that its edge stands near but not quite in contact with the drum. It allows the surface of the drum to pass it coated with a fresh layer of the adhesive material of uniform thickness. The

thickness may be adjusted at will by turning the hand-wheels H, and thereby adjusting the nearness of the scraper or gate C to the drum B at one end or both ends. There are two screws H, each operated independently by applying the hand to the corresponding hand-wheel I-l. Each screw is tapped through the front of the tank A and engages the corresponding end of the gate C between a collar II and a nut H The nut is firmly held by a jam-nut in the obvious manner. It follows that as the screw is adjusted endwise it carries with it that end of the gate C.

Between the edge of the feed-table A and the drum B, I mount a pair of feed-rolls I J. The lowermost I receives motion through a gear-wheel I from the gear-wheel B. The uppermost J rests on I. The motion of these feed-rolls coincides with that of the drum B, being only enough slower to insure that the paper shall be smoothly extended upon the latter.

A is a transverse bar extending across the machine under the drum, and A is a metallic deflector held on the bar A by means of a pinching-screw A This should-be so set that the upper edge of the deflector will almost but not quite touch the sheets of thin mate IOO rial which are being carried past it along on the drum. The deflector allows the drum, with its coating of adhesive material and. sheets of paper on its under surface, to move past without touching; but the current of air which accompanies it is caught by the defiector and directed downward, so that the paper after being detached from the drum moves in air which is practically still.

A is a cylindrical bar extending across the machine at a higher level. It supports a series of removable levers K k, the part K of each lever being cast-iron and the part 10 being a steel wire set therein, bent and sharpened at the lower end, as shown. The supe rior gravity of the portion K holds the points of the wires k, which I term clearing-points, gently against the drum B, and insures that the paper shall be detached from the .drum when it reaches this point. These parts K k are narrow, and are set side by side on the bar A. They present the clearing-points near together and in actual though gentle contact with the drum. They insure the detachment of the paper and its deflection away irom the drum in an oblique upward direc- L is a drum mounted in fixed bearings in the position shown, and receiving through gearing, as represented, asurface motion corresponding to that of the drum B. An endless apron 472 runs over the drum L. The apron 171. also runs over and in contact with the upper face of a work-table A which may be of any breadth to allow the attendants to work on each side of the apron, taking the pasted sheets from the apron as it traverses along between them.

N is a drum which keeps the apron or extended. I provide means for taking up any excessiveslack of the apron, and also for ad justing the angular position of this drum N, so as to guide the apron.

P is ashaft mounted in fixed hearings, in which it is capable of partially revolving.

P! is an arm fixed on shaft P. Its upper end supports one of the bearings of the drum N. A- short arm P extending horizontally from shaft P, receives a screw Q, the point of which strikes a plate on the floor. By adjusting this screw Q the shaft P may be turned slightly in its bearings.

P is an arm extending obliquely upward fromshaft P, on which it is fixed, and carrying a screwS. An arm R is mounted loosely on the shaft P. Its upper end supports one of the bearings of the drum N. The point of the screw S presses against a wing cast on the arm R. Adjusting the screw Q turns the shaft P and moves both arms P and B so as to move both ends of the drum N, and

. thereby increase or relax the tension of the apron m.

Adjusting the screwS changes the position of the loose arm R relatively to the shaft P, allowing the end of the drum supportedin thearm R to be set to right or left relatively to the arm P. This adjustment,

additional to the adjustment by the screwQ, serves to guide the apron and keep it always on the mid-length of its respective drums L and N.

T is a clearing-drum revolved in the position represented. Its surface may move, and preferably does move, somewhat faster than the drum. It is grooved both longitudinally and transversely with grooves of V-'section. These make the surface of this clearingdrum in eifect a series of pyramidal spurs, the motion of which is certain to deflect the front edge of each sheet of paper downward and insure its resting properly upon the apron m.

U u are a series of clearers held by pinching-screws U upon across-bar A One wire it lies in each of the circular grooves around the clearing-drum T. These are only important in case the sheets shall tend to stickto the points of the pyramidal spurs and be carried around therewith. The clearer-s insure their detachment.

I attach importance to the fact that the sheets are applied to the under instead of to the upper side of the drum B, for the reason that such method of pasting presents the sheets on the apron with their freshly-coated faces upward. This is very important, because the coated face is liableto stick. The ordinary practice of applying the sheetsto the upper side of the drum leaves th-em'with the coated side down, unless special provisionis made for turning .them after their removal. My methodavoids all the difficulties.

The gate 0 should be set forward a little, so as to entirely close the aperture between itself and the drum whenever the machine is stopped. This may be effected by turning the screws H by means of the hand-wheel H. Under ordinary conditions of working the gate 0 should be set backward from the drum B enough to allow a sufficient and uniform stratum of the'semi-fluid adhesive material to remain on the surface of the drum, which is moving downward past the gate 0.

I employ a pairof guide-bars A A ar ranged to serve as guides for the paper after it has passed through the feed-rolls- I J, and before it comes in contact with the drum B. These are of advantage in preventing the paper from either dropping too low by gravity in case the blast of air is weak' or risim up too high in obedience to the force of the blast when it is too strong.

Modifications may be made withoutdepart- -ing from the principle or sacrificing the advantages of the invention.

I do not confine the use of the invention to pasting paper in separate sheets for covering boxes. It maybe used with advantage in applying a coating of glue, gum, paste, or other adhesive substance, or even a coating of material not adhesive upon one side of sheets or rolls of paper, cloth, or other-thin material, in all cases delivering it on the apron with the coated surface upward.

When adhesive material is applied the paper or other material thus coated may be used for staying-up, trimming, covering, and labeling paper-boxes, also gumming paper forpostage-stamps, gummed labels, and other purposes.

My drum B is longer than is required to apply the coating upon any single sheet or strip. I can pass two or more narrow strips or sheets through the machine simultaneously. Any size or shape of paper or other material may be passed through the machine without requiring any previous preparation or adj ustment of any part.

I do not claim the combination of mechanism, such being made the subject of a separate patent, hearing date September 30, 1890, No. 437,545.

I claim as my invention- 1. The herein-described method of pasting or coating paper, which consists in carrying the sheets separately with their upper surface in contact with a pasting medium and conveying the sheets away therefrom with the coated surface uppermost, substantially as specified.

2. The hereimdescribed method of pasting or coating paper oranalogous material, which consists in carrying the sheets separately in a substantially horizontal direction, with the upper surface against a pasting medium, forcing air against the under side of the material at an inclination, and then conveying the sheets away with the pasted side uppermost, substantially as specified.

In testimony whereof I have hereunto set my hand, at New York city, this 28th day of August, 1888,in the presence of two subscribing witnesses.

MERRIOK F. \VILSON.

Witnesses:

W. B. GONSALVES, H. A. JOHNSTONE. 

